Submissions on the proposed Bus Rapid Transit network for Dublin were 67% "generally in favour" of the plans according to the National Transport Authority.
But the public consultation found strong opposition from Swords residents who feared negative impact on local housing estates.
Overall nearly 12% of submissions were totally opposed to the system known as Swiftway, with just under 22% undecided.
The Swiftway system would involve larger "bendy buses" operating like a LUAS with prepaying passengers, fewer stops and priority in traffic.
Three routes - from Swords and the Airport to the city centre, UCD to Blanchardstown and Tallaght to Clongriffin - would cost a total of €650 million, around one third the cost of light rail.
Overall the biggest concern raised was negative impact on residential amenities with Swords residents objecting to the route going through a green area at Pinegrove.
There were also safety concerns about children going to school in that area and elsewhere about pedestrian safety in general.
The next biggest issue raised was the routes selected with submissions stating that streets like Stoneybatter and South Great Georges St were too congested to take the new service.
It was also claimed that having a Swiftway interchange at Christchurch Place/Winetavern St junction would turn Christchurch Cathedral into a traffic island.
There were also concerns about increased parking in suburban estates along the routes and that Swiftway would delay or cause the abandonment of Metro North.
The National Transport Authority said the feedback will be considered during further planning and design work and there will be individual public consultation on each of the three schemes.
The authority plans to apply to An Bord Pleanála for approval for the Swords to City Centre Scheme early next year.